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-rw-r--r--net/tipc/udp_media.c448
1 files changed, 448 insertions, 0 deletions
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
new file mode 100644
index 000000000000..66deebc66aa1
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+++ b/net/tipc/udp_media.c
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1/* net/tipc/udp_media.c: IP bearer support for TIPC
2 *
3 * Copyright (c) 2015, Ericsson AB
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the names of the copyright holders nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include <linux/socket.h>
36#include <linux/ip.h>
37#include <linux/udp.h>
38#include <linux/inet.h>
39#include <linux/inetdevice.h>
40#include <linux/igmp.h>
41#include <linux/kernel.h>
42#include <linux/workqueue.h>
43#include <linux/list.h>
44#include <net/sock.h>
45#include <net/ip.h>
46#include <net/udp_tunnel.h>
47#include <net/addrconf.h>
48#include <linux/tipc_netlink.h>
49#include "core.h"
50#include "bearer.h"
51
52/* IANA assigned UDP port */
53#define UDP_PORT_DEFAULT 6118
54
55static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
56 [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC},
57 [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY,
58 .len = sizeof(struct sockaddr_storage)},
59 [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY,
60 .len = sizeof(struct sockaddr_storage)},
61};
62
63/**
64 * struct udp_media_addr - IP/UDP addressing information
65 *
66 * This is the bearer level originating address used in neighbor discovery
67 * messages, and all fields should be in network byte order
68 */
69struct udp_media_addr {
70 __be16 proto;
71 __be16 udp_port;
72 union {
73 struct in_addr ipv4;
74 struct in6_addr ipv6;
75 };
76};
77
78/**
79 * struct udp_bearer - ip/udp bearer data structure
80 * @bearer: associated generic tipc bearer
81 * @ubsock: bearer associated socket
82 * @ifindex: local address scope
83 * @work: used to schedule deferred work on a bearer
84 */
85struct udp_bearer {
86 struct tipc_bearer __rcu *bearer;
87 struct socket *ubsock;
88 u32 ifindex;
89 struct work_struct work;
90};
91
92/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
93static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
94 struct udp_media_addr *ua)
95{
96 memset(addr, 0, sizeof(struct tipc_media_addr));
97 addr->media_id = TIPC_MEDIA_TYPE_UDP;
98 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
99 if (ntohs(ua->proto) == ETH_P_IP) {
100 if (ipv4_is_multicast(ua->ipv4.s_addr))
101 addr->broadcast = 1;
102 } else if (ntohs(ua->proto) == ETH_P_IPV6) {
103 if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST)
104 addr->broadcast = 1;
105 } else {
106 pr_err("Invalid UDP media address\n");
107 }
108}
109
110/* tipc_udp_addr2str - convert ip/udp address to string */
111static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
112{
113 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
114
115 if (ntohs(ua->proto) == ETH_P_IP)
116 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port));
117 else if (ntohs(ua->proto) == ETH_P_IPV6)
118 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port));
119 else
120 pr_err("Invalid UDP media address\n");
121 return 0;
122}
123
124/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
125static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
126 char *msg)
127{
128 struct udp_media_addr *ua;
129
130 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
131 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
132 return -EINVAL;
133 tipc_udp_media_addr_set(a, ua);
134 return 0;
135}
136
137/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
138static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
139{
140 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
141 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
142 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
143 sizeof(struct udp_media_addr));
144 return 0;
145}
146
147/* tipc_send_msg - enqueue a send request */
148static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
149 struct tipc_bearer *b,
150 struct tipc_media_addr *dest)
151{
152 int ttl, err = 0;
153 struct udp_bearer *ub;
154 struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
155 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
156 struct sk_buff *clone;
157 struct rtable *rt;
158
159 clone = skb_clone(skb, GFP_ATOMIC);
160 skb_set_inner_protocol(clone, htons(ETH_P_TIPC));
161 ub = rcu_dereference_rtnl(b->media_ptr);
162 if (!ub) {
163 err = -ENODEV;
164 goto tx_error;
165 }
166 if (dst->proto == htons(ETH_P_IP)) {
167 struct flowi4 fl = {
168 .daddr = dst->ipv4.s_addr,
169 .saddr = src->ipv4.s_addr,
170 .flowi4_mark = clone->mark,
171 .flowi4_proto = IPPROTO_UDP
172 };
173 rt = ip_route_output_key(net, &fl);
174 if (IS_ERR(rt)) {
175 err = PTR_ERR(rt);
176 goto tx_error;
177 }
178 ttl = ip4_dst_hoplimit(&rt->dst);
179 err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, clone,
180 src->ipv4.s_addr,
181 dst->ipv4.s_addr, 0, ttl, 0,
182 src->udp_port, dst->udp_port,
183 false, true);
184 if (err < 0) {
185 ip_rt_put(rt);
186 goto tx_error;
187 }
188#if IS_ENABLED(CONFIG_IPV6)
189 } else {
190 struct dst_entry *ndst;
191 struct flowi6 fl6 = {
192 .flowi6_oif = ub->ifindex,
193 .daddr = dst->ipv6,
194 .saddr = src->ipv6,
195 .flowi6_proto = IPPROTO_UDP
196 };
197 err = ipv6_stub->ipv6_dst_lookup(ub->ubsock->sk, &ndst, &fl6);
198 if (err)
199 goto tx_error;
200 ttl = ip6_dst_hoplimit(ndst);
201 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, clone,
202 ndst->dev, &src->ipv6,
203 &dst->ipv6, 0, ttl, src->udp_port,
204 dst->udp_port, false);
205#endif
206 }
207 return err;
208
209tx_error:
210 kfree_skb(clone);
211 return err;
212}
213
214/* tipc_udp_recv - read data from bearer socket */
215static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
216{
217 struct udp_bearer *ub;
218 struct tipc_bearer *b;
219
220 ub = rcu_dereference_sk_user_data(sk);
221 if (!ub) {
222 pr_err_ratelimited("Failed to get UDP bearer reference");
223 kfree_skb(skb);
224 return 0;
225 }
226
227 skb_pull(skb, sizeof(struct udphdr));
228 rcu_read_lock();
229 b = rcu_dereference_rtnl(ub->bearer);
230
231 if (b) {
232 tipc_rcv(sock_net(sk), skb, b);
233 rcu_read_unlock();
234 return 0;
235 }
236 rcu_read_unlock();
237 kfree_skb(skb);
238 return 0;
239}
240
241static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
242{
243 int err = 0;
244 struct ip_mreqn mreqn;
245 struct sock *sk = ub->ubsock->sk;
246
247 if (ntohs(remote->proto) == ETH_P_IP) {
248 if (!ipv4_is_multicast(remote->ipv4.s_addr))
249 return 0;
250 mreqn.imr_multiaddr = remote->ipv4;
251 mreqn.imr_ifindex = ub->ifindex;
252 err = ip_mc_join_group(sk, &mreqn);
253#if IS_ENABLED(CONFIG_IPV6)
254 } else {
255 if (!ipv6_addr_is_multicast(&remote->ipv6))
256 return 0;
257 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
258 &remote->ipv6);
259#endif
260 }
261 return err;
262}
263
264/**
265 * parse_options - build local/remote addresses from configuration
266 * @attrs: netlink config data
267 * @ub: UDP bearer instance
268 * @local: local bearer IP address/port
269 * @remote: peer or multicast IP/port
270 */
271static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub,
272 struct udp_media_addr *local,
273 struct udp_media_addr *remote)
274{
275 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
276 struct sockaddr_storage *sa_local, *sa_remote;
277
278 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
279 goto err;
280 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
281 attrs[TIPC_NLA_BEARER_UDP_OPTS],
282 tipc_nl_udp_policy))
283 goto err;
284 if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) {
285 sa_local = nla_data(opts[TIPC_NLA_UDP_LOCAL]);
286 sa_remote = nla_data(opts[TIPC_NLA_UDP_REMOTE]);
287 } else {
288err:
289 pr_err("Invalid UDP bearer configuration");
290 return -EINVAL;
291 }
292 if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET) {
293 struct sockaddr_in *ip4;
294
295 ip4 = (struct sockaddr_in *)sa_local;
296 local->proto = htons(ETH_P_IP);
297 local->udp_port = ip4->sin_port;
298 local->ipv4.s_addr = ip4->sin_addr.s_addr;
299
300 ip4 = (struct sockaddr_in *)sa_remote;
301 remote->proto = htons(ETH_P_IP);
302 remote->udp_port = ip4->sin_port;
303 remote->ipv4.s_addr = ip4->sin_addr.s_addr;
304 return 0;
305
306#if IS_ENABLED(CONFIG_IPV6)
307 } else if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET6) {
308 struct sockaddr_in6 *ip6;
309
310 ip6 = (struct sockaddr_in6 *)sa_local;
311 local->proto = htons(ETH_P_IPV6);
312 local->udp_port = ip6->sin6_port;
313 local->ipv6 = ip6->sin6_addr;
314 ub->ifindex = ip6->sin6_scope_id;
315
316 ip6 = (struct sockaddr_in6 *)sa_remote;
317 remote->proto = htons(ETH_P_IPV6);
318 remote->udp_port = ip6->sin6_port;
319 remote->ipv6 = ip6->sin6_addr;
320 return 0;
321#endif
322 }
323 return -EADDRNOTAVAIL;
324}
325
326/**
327 * tipc_udp_enable - callback to create a new udp bearer instance
328 * @net: network namespace
329 * @b: pointer to generic tipc_bearer
330 * @attrs: netlink bearer configuration
331 *
332 * validate the bearer parameters and initialize the udp bearer
333 * rtnl_lock should be held
334 */
335static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
336 struct nlattr *attrs[])
337{
338 int err = -EINVAL;
339 struct udp_bearer *ub;
340 struct udp_media_addr *remote;
341 struct udp_media_addr local = {0};
342 struct udp_port_cfg udp_conf = {0};
343 struct udp_tunnel_sock_cfg tuncfg = {NULL};
344
345 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
346 if (!ub)
347 return -ENOMEM;
348
349 remote = (struct udp_media_addr *)&b->bcast_addr.value;
350 memset(remote, 0, sizeof(struct udp_media_addr));
351 err = parse_options(attrs, ub, &local, remote);
352 if (err)
353 goto err;
354
355 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
356 b->bcast_addr.broadcast = 1;
357 rcu_assign_pointer(b->media_ptr, ub);
358 rcu_assign_pointer(ub->bearer, b);
359 tipc_udp_media_addr_set(&b->addr, &local);
360 if (local.proto == htons(ETH_P_IP)) {
361 struct net_device *dev;
362
363 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
364 if (!dev) {
365 err = -ENODEV;
366 goto err;
367 }
368 udp_conf.family = AF_INET;
369 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
370 udp_conf.use_udp_checksums = false;
371 ub->ifindex = dev->ifindex;
372 b->mtu = dev->mtu - sizeof(struct iphdr)
373 - sizeof(struct udphdr);
374#if IS_ENABLED(CONFIG_IPV6)
375 } else if (local.proto == htons(ETH_P_IPV6)) {
376 udp_conf.family = AF_INET6;
377 udp_conf.use_udp6_tx_checksums = true;
378 udp_conf.use_udp6_rx_checksums = true;
379 udp_conf.local_ip6 = in6addr_any;
380 b->mtu = 1280;
381#endif
382 } else {
383 err = -EAFNOSUPPORT;
384 goto err;
385 }
386 udp_conf.local_udp_port = local.udp_port;
387 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
388 if (err)
389 goto err;
390 tuncfg.sk_user_data = ub;
391 tuncfg.encap_type = 1;
392 tuncfg.encap_rcv = tipc_udp_recv;
393 tuncfg.encap_destroy = NULL;
394 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
395
396 if (enable_mcast(ub, remote))
397 goto err;
398 return 0;
399err:
400 kfree(ub);
401 return err;
402}
403
404/* cleanup_bearer - break the socket/bearer association */
405static void cleanup_bearer(struct work_struct *work)
406{
407 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
408
409 if (ub->ubsock)
410 udp_tunnel_sock_release(ub->ubsock);
411 synchronize_net();
412 kfree(ub);
413}
414
415/* tipc_udp_disable - detach bearer from socket */
416static void tipc_udp_disable(struct tipc_bearer *b)
417{
418 struct udp_bearer *ub;
419
420 ub = rcu_dereference_rtnl(b->media_ptr);
421 if (!ub) {
422 pr_err("UDP bearer instance not found\n");
423 return;
424 }
425 if (ub->ubsock)
426 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
427 RCU_INIT_POINTER(b->media_ptr, NULL);
428 RCU_INIT_POINTER(ub->bearer, NULL);
429
430 /* sock_release need to be done outside of rtnl lock */
431 INIT_WORK(&ub->work, cleanup_bearer);
432 schedule_work(&ub->work);
433}
434
435struct tipc_media udp_media_info = {
436 .send_msg = tipc_udp_send_msg,
437 .enable_media = tipc_udp_enable,
438 .disable_media = tipc_udp_disable,
439 .addr2str = tipc_udp_addr2str,
440 .addr2msg = tipc_udp_addr2msg,
441 .msg2addr = tipc_udp_msg2addr,
442 .priority = TIPC_DEF_LINK_PRI,
443 .tolerance = TIPC_DEF_LINK_TOL,
444 .window = TIPC_DEF_LINK_WIN,
445 .type_id = TIPC_MEDIA_TYPE_UDP,
446 .hwaddr_len = 0,
447 .name = "udp"
448};
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-06 23:11:52 -0400